JaLCDOI | 10.18926/19634 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_32_15.pdf |

著者 | 森 政弘| 岡 久雄| |

抄録 | In a stiffness estimation of living body, an internal structure under the skin influences the measured results. Because a different stiffness of body caused by bones and muscles is obtained. In this paper, by using a measurement system of mechanical impedance, the relations between a viscoelasticity and a distance from the surface of silicone-gel model is calculated. This relation is applied to silicone-gel tumor model and a shape and a viscoelasticity of semi-sphere silicone-gel tumous are estimated. The obtained results are expressed as a reconstructed 3-D image of shape / viscoelasticity. The revised curve-fitting of mechanical impedance and the cancellation of peripheral vibration influence are proposed in order to increase an estimation acccuracy. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1998-04-20 |

巻 | 32巻 |

号 | 1-2号 |

開始ページ | 15 |

終了ページ | 22 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002309047 |

JaLCDOI | 10.18926/19663 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_33_2_39.pdf |

著者 | Yanagi Makoto| 岡 久雄| |

抄録 | The acousicmyogram (AMG) is a mechanical phenomenon recorded at the surface of an active muscle. It is used to monitor force production, fatigue, and contractile properties of muscle. In this study, the new electrode with accelerometer for electrostimulation and acoustic detection. It consists of Ag-AgCl active electrode and solid-gel annular groud, and a very light piezoresistive accelerometer. The recorded AMG waveform depends on the pulse amplitude and duration of stimulation current and its lag from the electroatimulation is about 7 ms. The strengh-duration (S-D) curve (the threshold current for stimulation vs. pulse duration) describes the excitability of muscle. The left forearm is electrostimulated by using the same electrode and the muscle vibration (AMG) is recorded with accelerometer. During the muscle fatigue, the S-D curve changes and the current threshold increases under the same pulse duration. The rheobase of S-D curve increases gradually but the chronaxie hardly changes during muscle fatigue. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1999-04-27 |

巻 | 33巻 |

号 | 2号 |

開始ページ | 39 |

終了ページ | 44 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002309185 |

JaLCDOI | 10.18926/19666 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_33_2_45.pdf |

著者 | Yamada Nobuya| 岡 久雄| |

抄録 | It is difficult to evaluate a biomechanical properties quantitatively. The authors developed the measurement system of biomechanical properties formerly but it is on a large scale because of the use of personal computer. In this study, the portable measurement system of biomechanical impedance/mobility is developed. To establish a rapid measurement, a random vibration is adopted in input signal. The system consists of the measuring probe, amplifier, and a note-typed personal computer. The measurement probe is developed newly, and has an overall length of 9 ㎝ (without a handle) and a total weight of about 500 g. The measurement program is also developed and is available to any computer which is worked under MS DOS compatible in Windows 95/98 operating system. The biomechanical spectra of thigh, temple and forehead are obtained and they show three typical spectrum patterns. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1999-04-27 |

巻 | 33巻 |

号 | 2号 |

開始ページ | 45 |

終了ページ | 50 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002309193 |

JaLCDOI | 10.18926/15501 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_24_2_67.pdf |

著者 | 名合 宏之| 前野 詩朗| |

抄録 | Many hydraulic structures are damaged by under flood flow and storm waves year after year. Many cases of dike and breakwater failure are caused by the suck out of sand from behind the revetment. This type of failure will be in close relation to the dynamic behavior of sand bed around the revetment. In this paper, from this point of view, we investigated the basic characteristics of such sand movement by small model tests and tried to explain the hydro- and soil-mechanical mechanism of this phenomenon theoretically. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1990-03-29 |

巻 | 24巻 |

号 | 2号 |

開始ページ | 67 |

終了ページ | 78 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307928 |

JaLCDOI | 10.18926/14058 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_42_44.pdf |

著者 | Ogawa Takafumi| 鶴田 健二| 東辻 千枝子| 東辻 浩夫| Hiroshi Iyetomi| |

抄録 | To analyze vibrational properties of Si crystal with a single charge-neutral vacancy, we perform large-scale simulations based on tight-binding molecular-dynamics method. Vibrational modes and frequencies are obtained by diagonalizing dynamical matrix within a harmonic approximation. Results indicate that there exist vibrational modes spatially localized around the vacancy and large frequency shifts associated with the localized modes contribute significantly to reduction of the vibrational free energy. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2008-01 |

巻 | 42巻 |

号 | 1号 |

開始ページ | 44 |

終了ページ | 47 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308412 |

JaLCDOI | 10.18926/14059 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_42_48.pdf |

著者 | 東辻 千枝子| Miyake Takashi| Nakanishi Kenta| 鶴田 健二| 東辻 浩夫| |

抄録 | Based on the mapping introduced by the classical-map hypernetted-chain (CHNC) method, classical numerical simulations, Monte Carlo and molecular dynamics, have been applied to the twodimensional electron fluid and the results are compared with those of quantum Monte Carlo simulations hitherto reported. It is shown that polarization properties of the ground state obtained by the diffusion Monte Carlo method are reproduced within the accuracy of quantum simulations by both of two mapping functions for the quantum temperature which have been proposed within the CHNC method. These results may serve as the basis of numerical simulations based on the CHNC method which are applicable to finite non-periodic systems like quantum dots and systems at finite temperatures. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2008-01 |

巻 | 42巻 |

号 | 1号 |

開始ページ | 48 |

終了ページ | 52 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308425 |

JaLCDOI | 10.18926/14061 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_42_56.pdf |

著者 | Miyake Takashi| 東辻 千枝子| Nakanishi Kenta| 鶴田 健二| 東辻 浩夫| |

抄録 | We analyze the ground state of the two-dimensional quantum system of electrons confined in a parabolic potential with the system size around 100. We map the system onto a classical system on the basis of the classical-map hypernetted-chain (CHNC) method which has been proven to work in the integral-equation-based analyses of uniform unbounded systems and then apply classical numerical simulations. We find that the confined system undergoes the transition to the spin polarized state with the decrease of the average density and the corresponding critical value is as low as rs ∼ 0.3 in terms of the usual rs parameter estimated for the average density. As the ground state for given value of the rs parameter, our data give the critical value for the transition around 20 which is consistent with the known possibility. The advantage of our method is a direct applicability to geometrically complex systems which are difficult to analyze by integral equations. The application to the structure like quantum dots reported here is the first example of such applications. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2008-01 |

巻 | 42巻 |

号 | 1号 |

開始ページ | 56 |

終了ページ | 59 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308633 |

JaLCDOI | 10.18926/14119 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_40_1_31.pdf |

著者 | 小川 貴史| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |

抄録 | We analyze the melting of spherical Yukawa clusters by Monte Carlo simulations. Spherical clusters are expected to be found in dusty plasmas in an isotropic environment such as microgravity and serve as a model for classical clusters. We obtain the specific heat through fluctuations of the potential energy and identify its peak as the transition temperature. Melting temperatures are compared with those of bulk Yukawa systems and it is confirmed that the melting temperature increases and approaches the bulk value with the increase of the system size. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2006-01 |

巻 | 40巻 |

号 | 1号 |

開始ページ | 31 |

終了ページ | 35 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308329 |

JaLCDOI | 10.18926/14120 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_40_1_36.pdf |

著者 | 内田 厚| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |

抄録 | We present a Stochastic-Difference-Equation (SDE) approach to long time-scale molecular dynamics (MD) simulations, which are required for nanosecond-scale phenomena. In this method, the MD trajectory in a fixed time period is obtained as a stationary solution of an action functional based on an error accumulation of the equation of motion along the path, thus reducing the problem to a boundary-value problem, instead of an initial-value problem in the ordinary MD method. We apply the method to formation processes of Cu thin film via nanocluster deposition onto a substrate. The applicability of the SDE algorithm to the problem and the effects of the choice of SDE parameters on the optimization processes of configuration pathway are examined. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2006-01 |

巻 | 40巻 |

号 | 1号 |

開始ページ | 36 |

終了ページ | 39 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308517 |

JaLCDOI | 10.18926/14121 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_40_1_40.pdf |

著者 | 三宅 隆| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |

抄録 | The electron system of arbitrary degeneracy can be mapped onto a classical system where electrons of the same spin are assigned an additional interaction and the effect of degeneracy is taken into account through an imaginative temperature. We apply this method to electrons in quantum dots modeled as two-dimensional electron liquid confined in a finite domain by a harmonic potential. We analyze distribution functions by molecular dynamics instead of solving integral equations which are not so useful in the case without translational invariance. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2006-01 |

巻 | 40巻 |

号 | 1号 |

開始ページ | 40 |

終了ページ | 43 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308268 |

JaLCDOI | 10.18926/14150 |
---|---|

フルテキストURL | Mem_Fac_Eng_39_1_46.pdf |

著者 | 門野 恵典| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |

抄録 | We present a real-space, polynomial-expansion approach to electron dynamics in nanostructured semiconductors. The Chebyshev expansion method is employed for efficient calculation of timeevolution of single-electron wave function. Details of the formulation are described. The method is applied to the electron transport in nanostructured semiconductors such as Si nanowires. The mean-square displacement and diffusivity of electron in Si chains are obtained as functions of length of the chains. The results show clearly ballistic behavior of electron in the pure Si chain. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2005-01 |

巻 | 39巻 |

号 | 1号 |

開始ページ | 46 |

終了ページ | 51 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308231 |

JaLCDOI | 10.18926/14152 |
---|---|

フルテキストURL | Mem_Fac_Eng_39_1_52.pdf |

著者 | 金森 克也| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |

抄録 | Thermal behavior of Coulomb clusters in a three dimensional confining potential is investigated by molecular dynamics simulations for system sizes of 1,000 to 20,288 ions. The specific heat of the system of shell-structured 20,000 ions is peaked almost at the same temperature as the system of bcc-structured 20,288 ions with much sharper structure for the latter. The diffusion coefficient and the peak to valley ratio of the two-dimensional pair distribution function on the outermost shell are obtained both as a function of temperature. The rotational movement of each shell in the system of 104 ions is observed. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2005-01 |

巻 | 39巻 |

号 | 1号 |

開始ページ | 52 |

終了ページ | 55 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308445 |

JaLCDOI | 10.18926/15348 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_35_21.pdf |

著者 | S.kovalenko, Volodymyr| Uno, Yoshiyuki| Okamoto, Yasuhiro| Anyakin, M.| Lutay, A.| Shubul, Khaled Al.| |

抄録 | In electric power industry, there is a problem of achieving stable joint in different components using high productive and efficient technologies. One type of these components is packages of slices for magnetic circuit of electric motors, transformers etc., which need reliable means for their fixing. Laser welding is proposed to solve this problem as an alternative for existing technologies. The development of the laser welding process is presented based on process simulation, study of heat history and comparison with experimental results. Laser beam additional scanning technique is proposed to improve the quality and efficiency of the joining operation. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2001-03-27 |

巻 | 35巻 |

号 | 1-2号 |

開始ページ | 21 |

終了ページ | 28 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307424 |

JaLCDOI | 10.18926/15358 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_35_63.pdf |

著者 | Shinomiya Shigeru| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |

抄録 | We present a theoretical study of Si(1-x)Ge(x) alloys based on tight-binding molecular dynamics (TBMD) calculations. First, we introduce a new set of nonorthogonal tight-binding parameters for silicon and germanium based on the previous work by Menon and Subbaswamy [Phys. Rev. B 55, 9231 (1997); J. Phys: Condens. Matter 10, 10991 (1998)]. We then apply the method to structural analyses of Si(1-x)Ge(x) alloys. The equilibrium volume and atomic structure for a given x are obtained by the TBMD method. We also calculate the bulk modulus B, elastic constants C(11), C(12) and C(44) as a function of x. The results show that the moduli vary monotonically, but nonlinearly, between the values of Si crystal and Ge crystal. The validity of the results is also discussed. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2001-03-27 |

巻 | 35巻 |

号 | 1-2号 |

開始ページ | 63 |

終了ページ | 75 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307673 |

JaLCDOI | 10.18926/15361 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_35_77.pdf |

著者 | Kishimoto Tokunari| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |

抄録 | In order to perform the large-scale molecular dynamics simulation of the Yukawa system, a mathematical expression for molecular dynamics using the fast multipole method is described. The model simulations are also performed to test the performance of our implementation of the FMM. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2001-03-27 |

巻 | 35巻 |

号 | 1-2号 |

開始ページ | 77 |

終了ページ | 95 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307940 |

JaLCDOI | 10.18926/15382 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_35_207.pdf |

著者 | 中西 透| Fujiwara Toru| |

抄録 | In the group signature scheme with a trusted party, a verifier can determine whether or not a signature is made by a member of the group, but cannot identify the member who signed the signature. In case of dispute later on, the signer can be identified by the trusted party. However, for efficient group signature schemes proposed so far, removing a member from the group can be not efficiently performed. In this paper, a group signature scheme with an easy membership canceling is proposed. By sending a request to use a resource together with the group signature on it to the manager of the resource, the manager can control anonymous accesses to the resource. In such an application, the proposed group signature scheme is suitable for canceling of the access privilege. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2001-03-27 |

巻 | 35巻 |

号 | 1-2号 |

開始ページ | 207 |

終了ページ | 212 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307232 |

JaLCDOI | 10.18926/17826 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_43_8.pdf |

著者 | Umeda Ryosuke| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |

抄録 | Metamaterial which has negative permittivity and permeability is investigated via computer simulations. Effects of the nanostructure on dielectric and magnetic properties of the material are taken into account by introducing the Drude-Lorentz model in the materials dispersion. We include multi-band process in the dielectric response in order to reproduce accurately experimental values of bulk Au thin film. Size effect on the dispersion is examined by comparing the model with that of a noble metal particle. Based on the dispersion model constructed, we analyze the electromagnetic response of nanostructured metamaterials to evanescent waves at microwave and optical frequencies via finite-difference time-domain simulatioins on parallel computer. A re- focusing and an amplification of the evanescent waves propagating through a metamaterial, consisting of metal slab/vacuum stacking, is demonstrated for the frequencies of 30GHz and 744THz. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2009-01 |

巻 | 43巻 |

開始ページ | 8 |

終了ページ | 15 |

ISSN | 1349-6115 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308833 |

JaLCDOI | 10.18926/17829 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_43_16.pdf |

著者 | Kurose Tomoyuki| 鶴田 健二| 東辻 千枝子| 東辻 浩夫| |

抄録 | The finite-difference time-domain (FDTD) method has been applied to the calculation of the phonon band structure of two-dimensional (2D) phononic crystals, consisting of metal cylinders placed periodically in liquid. By comparing several combinations of materials for metal cylinder and liquid, we analyze the dependence of the band structures on sound speed and density of liquid media. Moreover, the negative refraction of the acoustic waves is observed at the interfaces between phononic crystal slab and the liquid. We find that an acoustic“lens effect”with the slab appears due to the negative refractions. The relationship between the focal intensity in the lens effect and the band structure is discussed. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2009-01 |

巻 | 43巻 |

開始ページ | 16 |

終了ページ | 21 |

ISSN | 1349-6115 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308928 |

JaLCDOI | 10.18926/17831 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_43_22.pdf |

著者 | 東辻 浩夫| Chai Hong| 東辻 千枝子| 鶴田 健二| |

抄録 | For the transfer of quantum information and the creation of entangled states, the application of tuned spin chains, systems of spins with the nearest-neighbor coupling tuned so as to give high efficiency, has been proposed and some examples of high performance have been given by several authors. In this article, the effect of deviations from tuned values and the effect of resultant asymmetry are investigated through numerical simulations and theoretical analyses. It is shown that there exists a system where the transfer efficiency is comparable with exactly tuned ones and, at the same time, robust to noises in the coupling constants. It is also shown that the effect of asymmetry on the efficiency of entanglement creation is of the second order when the asymmetry is small. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2009-01 |

巻 | 43巻 |

開始ページ | 22 |

終了ページ | 26 |

ISSN | 1349-6115 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308966 |

JaLCDOI | 10.18926/19671 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_33_2_51.pdf |

著者 | 東辻 浩夫| 鶴田 健二| 東辻 千枝子| |

抄録 | Density functional molecular dynamics method is applied to hydrogen plasma in the domain of liquid metallic hydrogen. Tentative results for the proton-proton pair distribution function and the electron-proton pair distribution function are obtained. It is shown that with the increase of the parameter γ(s), we have increasingly strong screening of proton charge by electrons and the decrease of electron density in the domain between protons. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1999-04-27 |

巻 | 33巻 |

号 | 2号 |

開始ページ | 51 |

終了ページ | 59 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002309192 |